Ahh I see What situation would I need that in though? (don't say parking )

for example if you were in a situation where you needed to park the car on the side of a country road where ther was no street lighting,then this feature would be usfull to help alert other drivers that your car is parked on the side of the road before they actually reach it.

Indeed, one of my oppo's accidentally left the parking lights on his focus lit for 48 hours and the battery was flat as a pancake.
I'd recommend using them for no more than a couple of hours.
TBH I have never used mine.